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The Fast Flux Test Facility (FFTF) surveillance program provides coupon surveillance materials that are irradiated to the expected lifetime damage dose that the represented component will experience. This methodology requires a knowledge of the damage dose rates to the surveillance assemblies and to the critical locations of the structural components. This analysis updates the predicted exposures from a total fluence to a displacement per atom (dpa) basis using the Monte Carlo computer code for neutron photon transport, MCNP. The MCNP calculation improves the relative consistency and lowers the predicted damage rates uncertainty in a number of out-of-core locations. The results were used as part of the evaluation to extend the lifetime of the in-vessel components to 30 years in support of multiple missions for FFTF.
Principal Scientist, Westinghouse Hanford Company, Richland, Washington,